Incandescent electric lamp



4 Sheets-Sheet 1.

(No Mmm.)

J. NELSON. INGANDBSGENT ELECTRIC LAMP.

Patented Oct. 6, 1885.

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N PETERS. Pmmunmgmpher, washington, D. (L

(No ModeL) 4 Sheets-Sheet 2. J. NELSON.

INGANDESCBNT ELECTRIC LAMP.

(No Model.) 4 Sheets-Sheet 3. J. NELSON.

INGANDESGENT ELECTRIC LAMP.

Patented Oct. 6. 1885.

(No Model.) 4 Sheets-Sheet 4. J. NELSON.

NGANDBsGENT ELECTRIC LAMP.

No. 327,578. Patented` Oot. 6, 1885.

IliaiTnn STATES PATENT Ormea.

JOHN NELSON, OF ROCKFORD, ILLINOIS.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION' forming part of Letters Patent No. 327,578, dated October 6, 1885.

A pplicaiion iled February 9, 1883. Serial No. 84,445. (No model.)

T0 LZZ whom it r11/Ly concern:

Be it known that I, JOHN NELsoN, a citizen of the United States, residing in the city of Rockford, in the county of Vinnebago and State of Illinois, have invented new and use ful Improvements in Electric Lamps, of which the following` is a specification.

My invention relates to that class of electric lamps known as incandescent lamps, in which the in candescing conductor is inclosed in a glass globe or casing hermetically sealed. In this class of electric lampsthe incandescing conductor employed is usually of a curving bow-form generally known as the horse shoe7 incandescing conductor, and so far as known to me but one of such conductors is employed in a lamp; and the construction of this class of lamps is such that when the incandescing conductor becomes broken, or from any cause becomes unfit for use, the lamp is of no further use and cannot be repaired with profit. Further, these lamps in their construction have a limited lightgiving capacity, which in the use of the inished lamp cannot be varied io any considerable extent with profit.

To improve this class of lamps in these and other particulars, to render them capable of use a greater length of time with a like lightgiving capacity, or to increase their lightgiving capacity in various degrees for a like or greater length of time is the object of this invention, all of which willbehereinaftermore fully described.

In the accompanying drawings, Figure 1 is an elevation of an incandescing electric lamp containing three incandescing conductors placed in separate planes parallel to each other, and in which the features of my improvements are embodied in one form. Fig. 2 is a central vertical section on dotted line l. Fig. 3 is a plan view with incandescing conductors placed parallel with cach other. Fig. 4 is aplan View of the socket to receive the shank of the lamp. Figs. 5, G, 7, and 8 are transverse sections on dotted line 2, Fig. 2, showing the different positions ofthe lamp in the socket. Fig. 9 is an isometrical vertical central section of the socket on dotted line 3, Fig. 4C. Fig. 10 is an isometrical representation of the shank of the lamp designed to enter the socket. Fig. 11

is an isometrical representation of the grooved metallic circuit-closing plate of the socket. Fig. 12 is an isometrical representation of the grooved metallic non-circuitclosing plate of the socket. Fig. 13 is an isometrical representation of one of the metallic circuit-closing springs of the lamp-shank. Fig. 14 is a plan View of a lamp containing three incandescing conductors placed in the form of the letter H. Fig. 15 is a vertical central section of a lamp containing two incandescing con ductors placed in the form of a cross at right angles to each other in the same globe. Fig. 16 is a plan view of the lamp shown at Fig. 15. Figs. 17, 1S, and 19 are transverse sections on dotted line 4, Fig. 15, showing the different posit-ions of the lamp in the socket. Fig. 20 is a vertical central section of alamp containing two incandescing conductors, one placed within the other in the same Vertical plane.

In the gures in the accompanying drawings a, c', and c represent incandescing conductors or carbons of the usual well-known horseshoe form. These carbons are iixed at their end portions to suitable metallic supports, Z1, b, and b, in pairs, in this instance produced from copper ina manner to embrace the end portions of the carbon. These copper supports are suitably joined to platinum wires o, c, and c in pairs. These platinum wires are suitably joined in pairs to copper conducting-wires d, d', and ci. These conducting-wires are placed in a glass tube, e, in such a manner that their intermediate platinum wires c, c', and c shall be in the end portion of the tube properly separated in pairs, in which separate position they are fixed by melting and sealing t-he end portion of the glass tube round the platinum wires. This tube is then placed in the neck of a glass globe, f, in such position that the carbons shall occupy a central position iu the globe, in which position they are iixed by melting the neck end of the globe, by which means it is Xed to the open-end portion of the tube. 'Ihe conducting-wires d, d', and d, in pairs corresponding to their respective carbons, are separated to opposite sides of the tube, and these pairs are placed at equal divisions on the inner surface thereof, in which position IOS they are supported by means of a cork, h, inserted into the open end of the tube, which serves to press the wires against the tube and hold them in their relative position.

At t', i', and i are represented circuit-closing spring-bars produced from suitable metallic material, having their inner ends bent in suitable hook form, substantially as represented in Fig. 10, as a means by which to tix them in the shank of the lamp. The conducting-wires d, d', and d are suitably joined to the inner hook-end of these circuit-closing springs. These circuit-closing springs, with the conducting-wires attached, are arranged at equal-distances in pairs at opposite sides of a circle of proper diameter around the neck of the lamp, iu which position they are iiXed by means of a filling, k, of plasterofparis or other suitable non-eonducting material, forming a cylindrical neck or shank to thelamp, having the circuit-closing spring-bars d, d', and d placed upon its periphery in pairs on opposite sides, and the several spring-bars placed at substantially equal distances from each other and in the lengthwise direction of the shank. In this construction and arrangement the several pairs of circuit-closing spring-bars are designated by letters of the alphabet placed on the outer rim, Z, of the cylindrical shank of the lamp, readingin their order from left to right, and in this instance, when three carbons are employed, A represents one of the outside carbons, a,- B, the center carbon, a, and C the outer carbon, c. Y

At m is represented the metallic outer `cas ing of the lamp having one or" its ends at m reduced in size and internally screw-threaded to receive the screw-threaded end of a gaspipe support.

At m are represented the segment-formed end portions ot the circuit-closing or contact plates, from the outer curved edge of which rise, at proper intervals and of proper width, the circuit-closing or contact plates m, corrugated or grooved on their inner surface at fn, fn, n, wf, at, and n to receive the circuit-closing springs i, i', and i of the shank of the lamp.

At m4 are represented nou-conducting con tact-plates, corrugated or grooved on their inner surface ats, s', s, sf, s, and .S5 to receive the the circuit-closing springs i, i', and i of the shank of the lamp. These several corrugat, ed or grooved plates are placedin the metallic socket concentric therewith, and in -such poj sition that the corrugations or grooves shall be at equal intervals in a circle of proper diameter to receive the shank of the lamp snug'l ly, and in such position therein that the respective pairs of the corrugations or grooves ofthe respective pairs of plates shall be at opposite sides of the socket in position to receive the respective pairs or" circuit-closing springs on the opposite sides of the shank of the lamp. In this position the several corrugated or grooved plates are fixed in the metallic socket by means of a suitable lling, p,

of plastenof-paris or other non-conducting material, forming a socket to receive the shank of the lamp, in such a manner as to put into the electric circuit any one, two, or more of the incandescing conductors or carbons contained in the lamp.

At p are represented clampingscrews, one of which is placed in the segment end m of each of the corrugated or grooved circuitclosing plates.

At p are represented the insulated main couductingwires, designed to have a suitable end connection with the electric generator7 andA each wire properly connected with one of the segment end portions, m, of the two corrugated circuit-closing plates by means of thel clamping-screws, which, when the lamp is properly in place in the socket, will complete the circuit. The socket, near its upper edge, is numbered O, 1, 2, and 3, reading from left to right, as represented on the opposite sides ot" the several gures from it to 9, inclusive,

in which the 0 or zero-pointis placed radially opposite the single groove sin the non-conducting corrugated plates mi, and the numbers 1, 2, and 3 are placed radially opposite the groups of the three grooves n ii n in the circuit-closing plates m.

In the figures from 17 to 19, inclusive, where buttwo incandescing conductors or carbons are employed, the 0 or zero-point is placed radially opposite the single grooves in the nou-conducting corrugated plates m4, and the numbers 1 and 2 are placed radially opposite the groups of the two grooves n n in the circuit-closing plates m.

From the foregoing it will be seen that if the lamp be placed in the socket in such position that the letter A on the outer rim ofthe lampshank is over the numeral 1 on the upper portion of the socket, then the outside carbon, a, corresponding to the letter A, will be in circuit. [f the letter B on the shank is placed over the numeral 1 on the socket, the central carbon, a', corresponding to the letter B, will be in cir cuit, and if the letter C on the shank is placed over the numeral 1 on the socket, the outside carbon, a, corresponding to the letter C, will be in circuit. From which itwill be seen that any one of the several carbons a, ct, and a, corresponding to the letters A, B, and C, may be placed in circuit independently.

If the letter A on the shank is placed over the numeral 2 on the socket, the outside carbons, a and a, corresponding to the letters A and C on the shank, will be in circuit. If the letter B on the shank is placed over the numeral 2 on the socket, the carbons a and a', corresponding to the letters A and B, being one outside and center carbons, will be in circuit.

If the letter G on the shank is placed over the numeral 2 on the socket, then the carbons a and a, corresponding to the letters B and C on the shank, being the center and one outside carbons, will be in circuit. If any one of the letters A, B, or C on the shank is placed over IOO IIO

the numeral 3 on the socket, all three of the carbons a, a, and a, corresponding to the letters A7 B, and C, will bein circuit.

If any one of the letters A, B, and C on the shank of the lamp are placed over 0, the zeropoint on the socket, all of the carbons a, c', and a will be out of circuit.

From the foregoing it will bc seen that in my improved lamps containing two or three carbons any one, or any two, or all of the carbons may be placed in the circuit. If in the use of my improved lamp but one oi' the cai-bons is placed in the circuit at the same time, and when such carbon is rendered unfit for use another is placed in the circuit, the life of the lamp will be in proportion to the number of carbons incased in the globe; and if more than one carbon is placed in the circuit with a proper current to produce the required incandescence, the quantity of light produced will be in proportion to the number of carbons placed in the circuit. From which it will be seen that comparatively at a small additional irst cost Iproduce a lamp capable of greater usefulness than lamps of its class heretofore produced containing` but one carbon. In this instance I have illustrated a lamp containing two carbons and another containing three carbons; but evidently lamps containing more carbons may be constructed, and the relative position of the several carbons contained in the globe may be varied from those shown and described; and the form of the globe to contain the carbons may be varied to better adapt it to contain more carbons variously located within the globe; but these and like modifications will be within the scope of my invention so long as two or more carbons contained within the same globe are capable of joint or independent use for the purpose ofprolonging the life of the lamp or for increasing its lighting capacity.

I claim as my invention- 1. A lamp-receiving socket having a suitable conducting-connection with the electric generator, said socket provided with a corrugated or grooved circuit'closing surface and a corrugated or grooved non-circuit-closing surface to engage the circuit-closing surface of a lamp, substantially as and for the purpose hereinbefore set forth.

2. The combination, with a lamp-receiving socket provided with a corrugated or grooved circuit-closing surface and a corrugated or grooved non-circuit-closing surface, of a lamp having a shank provided with circuit-closers adapted to engage the circuitclosing and noncircuit-closing surface of the socket, substantially as and for the purpose hereinbefore set forth.

3. The combination7 with the circuit-closers of the lamp and with the circuit-closing and non-circuit-closing surface of the socket, of the index-letters and numerals, or their equivaleuts, substantially as and for the purpose 6 5 set forth.

J OHN NELSON. V'Vitnesses:

JACOB BEHEL, S.,A. D. BEHEL. 

